First of all, global warming has nothing to do with the ozone layer. Gobal warming stems around dumping greenhouse gasses, such as methane, and CO2 into the atmosphere. The depletion of the ozone layer occurs from CFC's breaking down O3. There are no naturally occuring sources of CFC's that I know of, including what volcanos spew out. Just take a look at the list of ozone depleting substances. these things don't occur in nature. http://www.epa.gov/ozone/ods.htmlPro-Hawk said:
If you understood the process of ozone formation, you would know that Ozone is formed when sunlight interacts with O2 and forms O3. The 'miraculous' holes that appear at the poles of the earth occur there because of the months of darkness they experience! Because there is no light coming in, there is no more ozone being produced. In southern chili, there are actaully warnings about the amount of radiation making it through the ozone layer and hitting your skin.
As for the hole, it grew dramatically from the 60's all the way through the 90's. Right now, it is becoming smaller, and R12 use is way down. That doesn't seem like a concidence since the break down of ozone has been seen with these CFC's in the laboratory.
Sure, the 'hole in the ozone layer' isn't going to effect me here in the mid-lattitudes, but I do acknoledge that this process is occuring, and that the ozone layer is an important part of the atmosphere.
Now for global warming. That is BS because the amount of CO2 and Methane that we produce is not that significant compared to the earths cycle. There is no evidence thus far that the slight increase in temperatures we have seen in the last 100 years is directly related to human activity. The global climate is variable, and we have no evidence that the change is just part of the normal earth cylce. Hell, did you know that the eruption of a volcane dropped the average temp of the earth by 1 degree for that particular year! I don't remember which one, but it was fairly recent.